My back knows with no uncertainty, I have been lifting rock all day. Ouch! The before and after pic hows just how much rock I lifted. This stuff is 2", pretty thick! I also planted three trees around the pit: 2 mesquite, 1 bird of paradise. Tomorrow I'll try to finish the rock laying and plant three more trees: eucalyptus, fig and texas sage (these are not for the fire pit). Mikey's been enjoying a lift free day by running the electric. Once the rocks done I will weld together a custom lamp.